package com.lagou.edu.filter;

import com.lagou.edu.feign.UserServiceFeignClient;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.http.HttpCookie;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * 定义全局过滤器，会对所有路由生效
 */
@Slf4j
@Component  // 让容器扫描到，等同于注册了
public class TokenFilter implements GlobalFilter, Ordered {

  @Autowired
  UserServiceFeignClient userServiceFeignClient;

  @Override
  public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
    // 思路：获取客户端ip，判断是否在黑名单中，在的话就拒绝访问，不在的话就放行
    // 从上下文中取出request和response对象
    ServerHttpRequest request = exchange.getRequest();
    ServerHttpResponse response = exchange.getResponse();

    String url = request.getURI().getPath();

    if (url.contains("/user/register")
      || url.contains("/user/isRegistered")
      || url.contains("/user/login")
      || url.contains("/code/create")
    ) {
      return chain.filter(exchange);
    }


    HttpCookie cookie = request.getCookies().getFirst("token") ;

    Boolean rst=false;

    if(cookie!=null){
      rst= userServiceFeignClient.token(cookie.getValue());
    }

    if(!rst){
      response.setStatusCode(HttpStatus.UNAUTHORIZED); // 状态码
            String data = "UNAUTHORIZED";
            DataBuffer wrap = response.bufferFactory().wrap(data.getBytes());
            return response.writeWith(Mono.just(wrap));
    }


    // 合法请求，放行，执行后续的过滤器
    return chain.filter(exchange);
  }


  /**
   * 返回值表示当前过滤器的顺序(优先级)，数值越小，优先级越高
   *
   * @return
   */
  @Override
  public int getOrder() {
    return 0;
  }
}
